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Long-Term Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2017
Debt Instrument [Line Items] |  |  |
Credit Agreement description |  | On October 18, 2010, the Company, Big 5 Corp. and Big 5 Services Corp. entered into a credit agreement with Wells Fargo Bank, National Association (“Wells Fargo”), as administrative agent, and a syndicate of other lenders, which was amended on October 31, 2011 and December 19, 2013 (as so amended, the “Credit Agreement”). On September 29, 2017, the parties amended certain provisions of the Credit Agreement (such amendment, the “Third Amendment”), as further discussed below. The amendment represented a modification and resulted in the payment and capitalization of $0.2 million in deferred financing fees. |
Payment in deferred financing fees |  | $ 248,000 |
Revolving credit facility | $ 140,000,000 | 140,000,000 |
First tier of increase to the borrowing capacity | 165,000,000 | 165,000,000 |
Maximum limit of credit facility | 200,000,000 | 200,000,000 |
Sublimit for issuances of letters of credit | 50,000,000 | 50,000,000 |
Sublimit for swingline loans | $ 20,000,000 | $ 20,000,000 |
Percentage of eligible credit card accounts receivables | 90.00% | 90.00% |
Percentage of the value of eligible inventory |  | 90.00% |
Percentage of the value of eligible in-transit inventory |  | 90.00% |
Eligible in-transit inventory threshold | $ 10,000,000 | $ 10,000,000 |
Debt instrument, covenant description |  | Obligations under the Credit Facility are secured by a general lien and perfected security interest in substantially all of the Company’s assets. The Credit Agreement contains covenants that require the Company to maintain a fixed charge coverage ratio of not less than 1.0:1.0 in certain circumstances, and limit the ability |
Events of default, description |  | The Credit Agreement contains customary events of default, including, without limitation, failure to pay when due principal amounts with respect to the Credit Facility, failure to pay any interest or other amounts under the Credit Facility for five days after becoming due, failure to comply with certain agreements or covenants contained in the Credit Agreement, failure to satisfy certain judgments against the Company, failure to pay when due (or any other default which does or may lead to the acceleration of) certain other material indebtedness in principal amount in excess of $5.0 million, and certain insolvency and bankruptcy events. |
Line of Credit Facility default debt minimum amount | 5,000,000 | $ 5,000,000 |
Maturity date of Credit Agreement |  | Dec. 19, 2018 |
Letter of credit commitments | $ 500,000 | $ 500,000 | $ 500,000
Wells Fargo Bank [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit borrowings, interest rate |  | 4.50% | 3.75%
Revolving Credit Borrowings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit borrowings, interest rate |  | 2.60% | 2.20%
Third Amendment to Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date of Credit Agreement |  | Sep. 29, 2022 |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed charge coverage ratio | 100.00% | 100.00% |
One-month LIBO rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit borrowings, interest rate |  | 1.60% | 0.80%
First Amendment to Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Oct. 31, 2011 |
Second Amendment to Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Dec. 19, 2013 |
Interest rate, description |  | the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, as adjusted to account for statutory reserves, plus one percent (1.00%), or (c) the rate of interest in effect for such day as publicly announced from time to time by Wells Fargo as its “prime rate.” |
Commitment fee assessed |  | 0.25% |
Second Amendment to Credit Agreement [Member] | Federal Funds Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin in addition to variable rate |  | 0.50% |
Second Amendment to Credit Agreement [Member] | LIBO Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin in addition to variable rate |  | 1.00% |
Third Amendment to Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement amendment date |  | Sep. 29, 2017 |
Payment in deferred financing fees |  | $ 200,000 |
Capitalization in deferred financing fees | $ 200,000 | 200,000 |
Revolving credit facility | 100,000,000 | 100,000,000 |
Sublimit for issuances of letters of credit | $ 25,000,000 | $ 25,000,000 |
Interest rate, description |  | the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, plus one percentage point (1.00%), or (c) the rate of interest in effect for such day as announced from time to time within Wells Fargo as its “prime rate.” |
Commitment fee assessed | 0.20% |  |
Third Amendment to Credit Agreement [Member] | Federal Funds Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin in addition to variable rate |  | 0.50% |
Third Amendment to Credit Agreement [Member] | LIBO Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin in addition to variable rate |  | 1.00% |
Wells Fargo Bank National Association [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Remaining borrowing availability | $ 94,500,000 | $ 94,500,000 | $ 129,500,000

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